Product Description:

The RD52.1-4N-200-R-NN-FW/S108 is a drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. Designed for industrial automation, this controller conditions incoming three-phase power and delivers regulated outputs that govern motor torque and speed. By executing high-speed current loops, it supports coordinated motion profiles used by conveyors, extruders, and forming machines, helping production lines maintain throughput while protecting mechanical components. It is intended for applications that need stable motor response during load changes and repeatable speed regulation over long operating periods.

This unit uses field-oriented vector control, which provides real-time flux and torque estimation to keep motor performance stable across the load range. Thermal management is handled through liquid cooling with an internal pump, a scheme used on frames of 132 kW and above, so circulated coolant removes loss heat without depending on ambient airflow. The liquid circuit moves heat away from the power section, which helps in installations where cabinet air movement is limited. The power section accepts line voltages from 380 to 480 V and uses a three-phase AC converter design, meaning it rectifies the three-phase mains before generating a controlled AC output. Supply tolerance of ±10% allows the controller to remain operational during moderate line fluctuations. The design omits a built-in brake chopper, so external dissipation hardware is required when regenerative energy must be absorbed.

At the output side, the drive can deliver up to 200 kW, which suits large-frame motors used in heavy material handling, extrusion, or pump service. Harmonic mitigation at the input is assisted by an integrated mains filter, which reduces conducted emissions into the plant distribution network. The hardware is generation 1, and it uses the mechanical layout and interface numbering found on early RD 52 models. This configuration is supplied without optional features, so any additional external functions can be selected separately to match the installation.